Process for the manufacture of gear-wheels.



No. 897,872. PATENTED SEPT. 8, 1908:

F.A.BRUN.

PROCESS FOR THE MANUFACTURE OF GEAR WHEELS.

APPLICATION FILED NOV. 30, 1906.

2 SHEETS-SHEET 1.

PATENTED SEPT. 8, 1908.

;F.A.BRUN. PROCESS FOR THE MANUFACTURE OF GEAR WHEELS.

APPLICATION FILED NOV. 30, 1906.

2 $HEETS-SHEET 2.

' siding at Trablaine, near Le Chambon-Feusion into position for treating the blank 10,

during the action of the die-rolls (Figs. 3

FREDERIC AMEDEE BRUN, OF TRABLAINE, NEAR LE CHAMBON-FEUGEROLLES, FRANCE.

PROCESS Specification of Letters Patent.

FOR Tm MANUFACTURE OF GEAB-WIEELS.

Patented. Sept. e, 1908.

Application filed November 30, 1906. Serial No. 345,781..

To all whom it may concern: I

Be it known that I, FRnDr'm-Ic Anemia EnUN, a citizen of the French Republic, re-

Loire, France, have invented a frccess for the Manufacture of Gear-Wheels,- of which the following is a specification.

invention relates to improvements in the process of manufacturing 4 gear-wheels described in the specification of British Letters Patent No. 25,862 of 1904.

The annexed drawing illustrates an example of apparatus suitab e for carrying out the improved process, Figure 1 bein a side view thereof, Fig. 2 a plan view partly in section on the line AB of Fig. 1, and Fig. 3 a horizontal section of the parts supporting the work, Fig. 4 is an elevation of a detail of the apparatus.

in the machine illustrated the rolls 5 are vertically and relatively adjustable and serve to laminate the rim of the wheel produced, in order to regulate the thickness thereof (Figs. 1, 2 and 3). A plurality of die-rolls 6 fixed to shafts 7 are supported by the rotary bearing-wheel 8 mounted on the shaft 9, so that each die-roll can be moved in succesgorolles,

the respective shaft 7 being driven by means of the'mechanism 11. If the faces of the blank 1.0 have been recessed before the teeth are formed the blank is "supported by means of the cups or disks 12 (Fig. 2), so that the circumference of the Wheel boss does not come into contact with the spindle 13. If the blank is inserted inthe form of a fiat disk, the latter may be supported by means of cups 12 provided with ribs, teeth or the like 14 to prevent displacement of the blank and 4).

It is absolutely essential that the pressure of the dies does not react on the circumference of the boss but on supporting rolls such, as those referred to in British-specification No. 11870 of 1906, or on the supporting cups 12 shown in the annexed drawing. If the blank were directly mounted on the spindle 13, the pressure exerted by the die-rolls 1 would, owing to the high temperature of the 1 blank, cause the boss of the latter to be distorted, and the indentation'produced would be irregular, in some cases to the extent of comprising an incorrect number of teeth.

In British specification N0. 11870/1906 it is stated that the operations of lamination and indentation may be separately efiected, but it must be understood that the operation of indentation may be combined either with lamination of the sides of the teeth alone or with lamination of the sides of the teeth and the sides of the wheel, as shown in Figs. 1, 2 and 3. For this purpose the adjustable rolls 5 are used, the said rolls being preferably arranged in the position indicated in order to allow of producing wheels with teeth of any given axial length with the aid of die-rolls 6 of any thickness. y

The" indentation may be efiected by means of a single die-roll instead of by-means of a plurality of rolls used in succession and mounted in bearings suchas those provided by the wheel 8. The process may be so con ducted that it comprises, firstly, the opera tion of marking or notching the circumference of the blank by means of a toothed. roll of a certain diameter and with teeth of the same pitch as those to be impressed, and secondly, the operation of; enlarging the notches by means of a dier'oll or a succession of dierolls until the work is finished.

In all cases the indentation is effected without invariable connectionbetween the centers and without reaction on the center of the work. The driven member, Whether Wheel, roll or die, may alternating circular movement.

What I claim as my invention and desire to secure by Letters Patent of the United States is 1. In the process of toothed Wheels by circular lamination. and impression of heated blanks, theoperation consisting in rolling a die roll on the circumference of the blank and at the same time laminating the lateral faces of the teeth and the rim of the wheel, the blank being supported at points between the. central boss of the blank and the circumference and in such a way that the rolling of the die wheel takesv place Without reaction on the central boss of the blank.

2. In the process of manufacturing gear wheels by circular lamination and impression of heated blanks, the operation consistin in rolling on the circumference of the bla r a plurality of successively acting die-rolls of different configurations and at the same manufacturing have continuous or the blanl; end the circumference, and in such Way that the rolling of the successive (lie wheels takes place Without reaction on the central boss of the blank.

In witness whereof I have signed this speclficatlon 1n the presence of two w tnesses.

FREDERIO AMEDEE BRUN.

\Vitnesses VERDI AUGUSTIN JOSEPH MERLLII, FERDINAND EMILE XAVIER LAUDY. 

